Centrifugal churn.



PATENTED JAN. 10, 1905.

P. A. M. ARNBERG.

GENTRIFUGAL GHURN.

APPLICATION FILED MAR. 6, 1903.

WWW/MM TTE STATES Patented January 10, 1905.

PATENT OEEIcE.

PER AXEL MAURITZ ARNBERG, OF STOCKHOLM, SWVEDEN, ASSIGNOR TO NYAAKTIEBOLAGET RADIATOR, OF STOCKHOLM, SWEDEN, A STOCK COMPANY.

@IENTRIFUGAL CHURN.

SPECIFICATION forming part of Letters Patent No. 779,986, dated January10, 1905.

Application filed March 6, 1903. Serial No. 146,552.

To all whom it may concern.-

Be it known that 1, PER AXEL MAURITZ ARNBERG, a subject of the King ofSweden and Norway, and a resident of Stockholm, Sweden, have inventednew and useful Improvements in Centrifugal Churns, of which thefollowing is a specification, reference being had to the drawingsaccompanying and forming a part hereof.

This invention relates to improvements in centrifugal churns in whichthe churning is accomplished by means of one or more skimming-pipeswhich take the cream from the inner wall of the liquid-cylinder insidethe churning vessel and violently throws out the same against the saidwall through suitable openings. The rear ends of such skimmingpipesheretofore used have been bent upward at a right angle, or approximatelyso, and the outlet-openings have been arranged in the upright partof theskimming-pipes, which has caused a large resistance against the movementof the cream through the said pipes, requiring a comparatively largepower for driving the machine, inasmuch as a certain amount of power iswasted in changing the direction of movement of the liquid when thelatter passes the angle of the pipe and when it is thrown out throughthe openings of the same.

The object of the invention is to provide a skimming-pipe by which thesaid inconvenience will be obviated.

The invention consists, briefly, in placing the skimming pipe or pipeshorizontally, or substantially so, and in providing a perforated bottomor the like in the rear end of the-said skimming pipe or pipes forspreading the liquid over a large surface. The skimming-pipe being onlyslightly bent for the purpose hereinaftcr set forth will, as easilyunderstood, offer only a small resistance against the move ment of theliquid, and by arranging the outlet-openings in the end of theskimming-pipe the liquid will be thrown out in the longitudinaldirection of the said pipe without change of the direction of movementof the liquid.

In the accompanying drawings, Figure 1 shows a Vertical section of theupper part of a usual centrifugal drum and a churning vessel arrangedthereon. Fig. 2 is a horizontal section on line A B in Fig. 1. Figs. 3,i, and 5 show modified forms of the spreading device in the outlet endof the skimming-pipe.

Referring to the drawings, 1 represents a usual centrifugalseparator-drum, and 2 an upper apartment arranged thereon andconstituting in well-known manner a churn. The cream separated in thecentrifugal drum 1 rises into the said upper apartment through one ormore perforated screws 3 or the like. The said churning vessel 2 is inthe usual manner surrounded by a ring-shaped cooling-chamber 4,

containing a gas or liquid, whereby the cream will be gradually cooledoff, according as it rises along the wall of the vessel 2. In the latteris provided a skimming-pipe 6 7, which may be attached to a fixed bar orthe like 5, supported in any convenient manner by a fixed part of theframe of the machine. The one end 6 of the said pipe is in the usualmanner arranged to skim the cream from the wail of liquid inside thechurning vessel 2, while its other or rear end for the purposehereinafter set forth is adapted to throw out the cream thus skimmed.The said skimming-pipe may, as shown in the drawings, be bentapproximately after the wall of liquid inside the churning vessel and atthe same time it may be slightly bent upward in order that the creamskimmed up by the same may be thrown out against a part of the wall ofliquid, which has already been suflieiently cooled off for the churning.It will be understood thataskimming-pipe of the shape illustrated in thedrawings will offer but a small resistance against the movement of thecream through the same, the direction of movement of the liquid beingonly slightly changed in the same. In order that the cream may be thrownout from the skimming-pipe with the smallest possible resistance, theoutlet opening or openings are arranged in the end 7 of the said pipe,whereby the cream will be thrown out approximatel y in the longitudinaldirection of the same. In

order to distribute the cream over a larger surface, different means maybe provided in the rear end 7 of the skimming-pipe. For instance, theoutlet end of the skimming-pipe may be provided with a cross consistingof wedge-shaped bars 8, as shown in Fig. 3, or with a perforated bottom9, the holes of which may be diverging, as shown in Fig. 4, or parallel,as shown in Fig. 5. In the latter case the holes of the said bottom 9may suitably be wider at their inner ends in order to eflect the desiredspreading of the cream.

In Figs. 1 and 2, 10 represents inlet-pipes for introducing a coolingliquid into the cooling-chamber 4:, and 11 represents dischargepipes forthe said cooling liquid.

I do not limit myself to the exact shape of the skimming-pipeillustrated in the drawings, since the same may be modified in variousmanners, as will be easily understood by those skilled in the art,without deviating from the principle of the invention.

Having now particularly described my invention and in what manner thesame may be IER AXEL MAURITZ ARNBERG.

Vitnesses:

JOHN DELMAR, KARL RUNCSKOG.

